Thiamine
Thiamine, also known as Vitamin B1, is found naturally in foods like whole grains, pulses, nuts, and cereals. Most of us don't get enough Thiamine in our diets, so it’s commonly added to foods. Thiamine has been shown to be effective in treating patients with anxious feelings, chronic fatigue, insomnia, and headaches.
Reference: ncbi.nlm.nih.gov